Fix timewarp attacks

[ariard]

See conversation on https://delvingbitcoin.org/t/timewarp-miners-harvesting-and-vaults/218

Good open question on any timewarp fix, do we wish to constrain future consensus rules evolvability w.rt things like “forward block”.

[levantah]

How useful is fixing timewarp attacks on a permissioned PoW network?

I understand it makes a lot of sense on testnet4 or future mainnet softfork, but the miner of a Signet network (even a custom signet one) is not incetivized to trigger timewarp. Maybe for learning and experimentation purposes?

[ariard]

Maybe for learning and experimentation purposes?

Yes, if timewarp fixes ported on mainnet a day.